U.S. patent application number 13/057263 was filed with the patent office on 2011-06-16 for communication system, mobile station device, and communication method.
This patent application is currently assigned to SHARP KABUSHIKI KAISHA. Invention is credited to Toshizo Nogami, Shohei Yamada.
Application Number | 20110141996 13/057263 |
Document ID | / |
Family ID | 41663483 |
Filed Date | 2011-06-16 |
United States Patent
Application |
20110141996 |
Kind Code |
A1 |
Yamada; Shohei ; et
al. |
June 16, 2011 |
COMMUNICATION SYSTEM, MOBILE STATION DEVICE, AND COMMUNICATION
METHOD
Abstract
A mobile station device which communicates with a base station
device, the mobile station device includes: an information
acquisition unit which acquires information, which specifies at
least one second frequency band different from a first frequency
band, transmitted using RRC signaling via a physical downlink
shared channel within the first frequency band; a frequency band
specification unit which specifies the second frequency band based
on the information acquired by the information acquisition unit;
and a communication unit which communicates with the base station
device with use of the first frequency band or the second frequency
band.
Inventors: |
Yamada; Shohei; (Osaka-shi,
JP) ; Nogami; Toshizo; (Osaka-shi, JP) |
Assignee: |
SHARP KABUSHIKI KAISHA
Osaka-shi, Osaka
JP
|
Family ID: |
41663483 |
Appl. No.: |
13/057263 |
Filed: |
August 5, 2009 |
PCT Filed: |
August 5, 2009 |
PCT NO: |
PCT/JP2009/003757 |
371 Date: |
February 2, 2011 |
Current U.S.
Class: |
370/329 |
Current CPC
Class: |
H04L 5/0094 20130101;
H04W 72/042 20130101; H04L 5/001 20130101; H04L 27/2601 20130101;
H04L 5/0044 20130101; H04L 5/0098 20130101; H04W 72/0453 20130101;
H04W 72/04 20130101; H04L 1/1819 20130101 |
Class at
Publication: |
370/329 |
International
Class: |
H04W 40/00 20090101
H04W040/00 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 6, 2008 |
JP |
2008-203361 |
Claims
1-6. (canceled)
7. A communication system comprising a base station device and a
mobile station device, wherein the base station device comprises: a
signal transmission unit which transmits a signal including
information, which specifies at least one second frequency band
different from a first frequency band, to the mobile station device
with use of RRC signaling via a physical downlink shared channel
within the first frequency band, and the mobile station device
comprises: an information acquisition unit which acquires the
information, which specifies the at least one second frequency band
different from the first frequency band, to be transmitted using
the RRC signaling via the physical downlink shared channel within
the first frequency band; a frequency band specification unit which
specifies the second frequency band based on the information
acquired by the information acquisition unit; and a communication
unit which communicates with the base station device with use of
the first frequency band and the second frequency band.
8. The communication system according to claim 7, wherein the
frequency band specification unit specifies whether or not a
specific physical channel in the second frequency band is included
based on the information acquired by the information acquisition
unit.
9. The communication system according to claim 7, wherein a common
control channel is used as a logical channel, which carries the RRC
signaling.
10. The communication system according to claim 7, wherein a
dedicated control channel is used as a logical channel, which
carries the RRC signaling
11. A mobile station device which communicates with a base station
device, the mobile station device comprising: an information
acquisition unit which acquires information, which specifies at
least one second frequency band different from a first frequency
band, transmitted using RRC signaling via a physical downlink
shared channel within the first frequency band; a frequency band
specification unit which specifies the second frequency band based
on the information acquired by the information acquisition unit;
and a communication unit which communicates with the base station
device with use of the first frequency band and the second
frequency band.
12. The mobile station device according to claim 11, wherein the
frequency band specification unit specifies whether or not to
include a specific physical channel located within the second
frequency band based on the information acquired by the information
acquisition unit.
13. The mobile station device according to claim 11, wherein a
common control channel is used as a logical channel, which carries
the RRC signaling.
14. The mobile station device according to claim 11, wherein a
dedicated control channel is used as a logical channel, which
carries the RRC signaling.
15. A communication method using a base station device and a mobile
station device, the communication method comprising: transmitting,
by the base station device, a signal including infoiination, which
specifies at least one second frequency band different from a first
frequency band, to the mobile station device with use of RRC
signaling via a physical downlink shared channel within the first
frequency band, acquiring, by the mobile station device, the
information, which specifies the at least one second frequency band
different from the first frequency band, to be transmitted using
the RRC signaling via the physical downlink shared channel within
the first frequency band; specifying, by the mobile station device,
the second frequency band based on the information acquired in the
acquisition; and communicating, by the mobile station device, with
the base station device with use of the first frequency band and
the second frequency band.
16. The communication method according to claim 15, wherein, in the
specification, it is specified whether or not a specific physical
channel in the second frequency band is included based on the
information acquired in the acquisition.
17. The communication method according to claim 15, wherein a
common control channel is used as a logical channel, which carries
the RRC signaling.
18. The communication method according to claim 15, wherein a
dedicated control channel is used as a logical channel, which
carries the RRC signaling.
Description
TECHNICAL FIELD
[0001] The present invention relates to a communication system, a
mobile station device, and a communication method.
[0002] This application claims priority to and the benefits of
Japanese Patent Application No. 2008-203361 filed on Aug. 6, 2008,
the disclosure of which is incorporated herein by reference.
BACKGROUND ART
[0003] Third Generation Partnership Project (3GPP) is a project in
which specifications of mobile phone systems are studied and
created. 3GPP is based on an evolved network of wideband code
division multiple access (W-CDMA) and a global system for mobile
communications (GSM).
[0004] In 3GPP, a W-CDMA scheme has been standardized as a 3.sup.rd
generation cellular mobile communication scheme and its services
have been sequentially initiated. Also, high-speed downlink packet
access (HSDPA) having a higher communication rate has been
standardized and its services have been initiated.
[0005] In 3GPP, evolved universal terrestrial radio access (EUTRA),
which is the evolution of 3G radio access technology, has been
studied.
[0006] In EUTRA, an orthogonal frequency division multiple access
(OFDMA) scheme has been proposed as a downlink communication
scheme. OFDMA is a scheme of performing multiplexing of users by
subcarriers orthogonal to each other.
[0007] In the OFDMA scheme, a technique called an adaptive
modulation and coding scheme (AMCS) based on adaptive radio link
control (link adaptation) of channel coding or the like is
applied.
[0008] The AMCS is a scheme of switching radio transmission
parameters (also referred to as AMC modes) of an error correction
scheme, a coding rate of error correction, a data modulation
multinary number, and the like in response to channel qualities of
mobile station devices so as to efficiently perform high-speed
packet data transmission.
[0009] The channel qualities of the mobile station devices are fed
back to a base station device with use of a channel quality
indicator (CQI).
[0010] FIG. 19 is a diagram illustrating a channel configuration
used in a radio communication system of the related art. This
channel configuration is used in a radio communication system such
as the EUTRA (see Non-Patent Document 1). The radio communication
system shown in FIG. 19 includes a base station device 1000 and
mobile station devices 2000a, 2000b, and 2000c. R01 denotes a range
where the base station device 1000 is communicable. The base
station device 1000 communicates with a mobile station device,
which exists in the range R01.
[0011] In EUTRA, a physical broadcast channel (PBCH), a physical
downlink control channel (PDCCH), a physical downlink shared
channel (PDSCH), a physical multicast channel (PMCH), a physical
control format indicator channel (PCFICH), and a physical hybrid
automatic repeat request (ARQ) indicator channel (PHICH) are used
in a downlink through which a signal is transmitted from the base
station device 1000 to the mobile station devices 2000a to
2000c.
[0012] In EUTRA, a physical uplink shared channel (PUSCH), a
physical uplink control channel (PUCCH), and a physical random
access channel (PRACH) are used in an uplink through which signals
are transmitted from the mobile station devices 2000a to 2000c to
the base station device 1000.
[0013] FIG. 20 is a diagram showing an example of a band used in
the radio communication system of the related art. In FIG. 20, the
horizontal axis represents a frequency and the vertical axis
represents a carrier frequency. In FIG. 20, the carrier frequency
is f11. The base station device and the mobile station device
perform communication using one continuous band W11 in a frequency
axis. A method using the above-described band is used in the
general radio communication system such as EUTRA.
[0014] FIG. 21 is a diagram showing another example of bands used
in the radio communication system of the related art. In FIG. 21,
the horizontal axis represents a frequency. In FIG. 21, the base
station device and the mobile station device perform communication
using a plurality of discontinuous bands W21 and W22 in the
frequency axis. As shown in FIG. 21, aggregation is referred to as
a composite use of a plurality of discontinuous bands in the
frequency axis.
[0015] However, if the base station device and the mobile station
device perform communication using a plurality of discontinuous
frequency bands as shown in FIG. 21 in the radio communication
system known in the related art, the mobile station device needs to
specify a plurality of frequency bands by communicating with the
base station device. Thus, there is a problem in that communication
may not be rapidly initiated since information to be transmitted
from the base station device to the mobile station device increases
at the initiation of communication.
[0016] Non-Patent Document 1: 3GPP TS (Technical Specification)
36.300, V8.4.0 (2008-03), Technical Specification Group Radio
Access Network, Evolved Universal Terrestrial Radio Access (E-UTRA)
and Evolved Universal Terrestrial Radio Access Network (E-UTRAN);
Overall description; Stage 2 (Release 8)
DISCLOSURE OF INVENTION
Problem to be Solved by the Invention
[0017] The present invention has been made in view of the
above-described circumstances, and an object of the invention is to
provide a communication system, a mobile station device, and a
communication method that can reduce information to be transmitted
from a base station device to the mobile station device at the
initiation of communication and that can rapidly initiate
communication.
Means for Solving the Problem
[0018] (1) The present invention has been made to solve the
above-described problems. According to an aspect of the present
invention, there is provided a communication system including a
base station device and a mobile station device, wherein the base
station device includes: a signal transmission unit which transmits
a signal including information, which specifies at least one second
frequency band different from a first frequency band, to the mobile
station device with use of RRC signaling via a physical downlink
shared channel within the first frequency band, and the mobile
station device includes: an information acquisition unit which
acquires the information, which specifies the at least one second
frequency band different from the first frequency band, to be
transmitted using the RRC signaling via the physical downlink
shared channel within the first frequency band; a frequency band
specification unit which specifies the second frequency band based
on the information acquired by the information acquisition unit;
and a communication unit which communicates with the base station
device with use of the first frequency band or the second frequency
band. [0019] (2) According to another aspect of the present
invention, there is provided a mobile station device which
communicates with a base station device, the mobile station device
including: an information acquisition unit which acquires
information, which specifies at least one second frequency band
different from a first frequency band, transmitted using RRC
signaling via a physical downlink shared channel within the first
frequency band; a frequency band specification unit which specifies
the second frequency band based on the information acquired by the
information acquisition unit; and a communication unit which
communicates with the base station device with use of the first
frequency band or the second frequency band. [0020] (3) In the
mobile station device according to the aspect of the present
invention, the frequency band specification unit may specify
whether or not to include a specific physical channel located
within the second frequency band based on the information acquired
by the information acquisition unit. [0021] (4) In the mobile
station device according to the aspect of the present invention, a
common control channel may be used as a logical channel, which
carries the RRC signaling. [0022] (5) In the mobile station device
according to the aspect of the present invention, a dedicated
control channel may be used as a logical channel, which carries the
RRC signaling. [0023] (6) According to still another aspect of the
present invention, there is provided a communication method using a
base station device and a mobile station device, the communication
method including: transmitting, by the base station device, a
signal including information, which specifies at least one second
frequency band different from a first frequency band, to the mobile
station device with use of RRC signaling via a physical downlink
shared channel within the first frequency band, acquiring, by the
mobile station device, the information, which specifies the at
least one second frequency band different from the first frequency
band, to be transmitted using the RRC signaling via the physical
downlink shared channel within the first frequency band;
specifying, by the mobile station device, the second frequency band
based on the information acquired in the acquisition; and
communicating, by the mobile station device, with the base station
device with use of the first frequency band or the second frequency
band.
Effect of the Invention
[0024] A communication system, a mobile station device, and a
communication method of the present invention can reduce
information to be transmitted from a base station device to the
mobile station device at the initiation of communication and can
rapidly initiate communication.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] FIG. 1 is a diagram showing a method of arranging physical
resource blocks (PRBs) according to a first embodiment of the
present invention.
[0026] FIG. 2 is a diagram showing a downlink channel configuration
used in a communication system according to the first embodiment of
the present invention.
[0027] FIG. 3 is a diagram showing an uplink channel configuration
used in a communication system according to the first embodiment of
the present invention.
[0028] FIG. 4 is a diagram showing a frame structure used in a
downlink of a radio communication system according to the first
embodiment of the present invention.
[0029] FIG. 5 is a diagram showing a frame structure used in an
uplink of the radio communication system according to the first
embodiment of the present invention.
[0030] FIG. 6 is a schematic block diagram showing a configuration
of a base station device 100 according to the first embodiment of
the present invention.
[0031] FIG. 7 is a schematic block diagram showing a configuration
of a mobile station device 200 according to the first embodiment of
the present invention.
[0032] FIG. 8 is a schematic block diagram showing configurations
of a data control unit 101a, an OFDM modulation unit 102a, and a
radio unit 103a of the base station device 100 (FIG. 6) according
to the first embodiment of the present invention.
[0033] FIG. 9 is a diagram showing an example of a signal to be
transmitted from the base station device 100 to the mobile station
device 200 according to the first embodiment of the present
invention.
[0034] FIG. 10 is a schematic block diagram showing configurations
of a radio unit 203a, a channel estimation unit 205a, an OFDM
demodulation unit 206a, and a data extraction unit 207a of the
mobile station device 200 (FIG. 7) according to the first
embodiment of the present invention.
[0035] FIG. 11 is a diagram showing an example of bands used in the
radio communication system according to the first embodiment of the
present invention.
[0036] FIG. 12 is a schematic block diagram showing configurations
of a data control unit 101b, an OFDM modulation unit 102b, and a
radio unit 103b of the base station device according to a modified
example of the first embodiment of the present invention.
[0037] FIG. 13 is a schematic block diagram showing configurations
of a radio unit 203b, a channel estimation unit 205b, an OFDM
demodulation unit 206b, and a data extraction unit 207b of the
mobile station device according to a modified example of the first
embodiment of the present invention.
[0038] FIG. 14 is a sequence diagram and the like showing
processing of the radio communication system according to the first
embodiment of the present invention.
[0039] FIG. 15 is a diagram showing an example of a system band
configuration used in the first embodiment of the present
invention.
[0040] FIG. 16 is a diagram showing another example of a system
band configuration used in the first embodiment of the present
invention.
[0041] FIG. 17 is a sequence diagram showing processing of a radio
communication system according to a second embodiment of the
present invention.
[0042] FIG. 18 is a sequence diagram showing processing of a radio
communication system according to a third embodiment of the present
invention.
[0043] FIG. 19 is a diagram illustrating a channel configuration
used in a radio communication system of the related art.
[0044] FIG. 20 is a diagram showing an example of a band used in a
radio communication system of the related art.
[0045] FIG. 21 is a diagram showing another example of bands used
in a radio communication system of the related art.
BEST MODE FOR CARRYING OUT THE INVENTION
First Embodiment
[0046] First, the first embodiment of the present invention will be
described. According to the first embodiment of the present
invention, a radio communication system includes one or more base
station devices and one or more mobile station devices, and radio
communication is performed therebetween. One base station device
constitutes one or more cells. One or more mobile station devices
can be accommodated in one cell.
[0047] FIGS. 1(a) and 1(b) are diagrams showing a method of
arranging PRBs of a downlink according to the first embodiment of
the present invention. Here, a broadband system using a plurality
of discontinuous system bands (occupancy bands) will be described.
An example of a method of arranging PRBs, which are allocation
units of a user, will be also described. In FIG. 1(a), the vertical
axis represents a frequency. In FIG. 1(b), the horizontal axis
represents a time and the vertical axis represents a frequency.
[0048] As shown in FIG. 1(a), a plurality of system bands (here,
system bands W1 and W2) are used when the base station device and
the mobile station device perform communication in the first
embodiment of the present invention. A plurality of subcarriers are
included in each of the system band W1 and the system band W2.
[0049] FIG. 1(b) shows an example of a configuration of a subframe
(subframe #F0 whose subframe number is 0), which is a transmission
unit in orthogonal frequency division multiple (OFDM) that is a
type of multicarrier communication scheme.
[0050] One subframe includes at least one slot. Here, for example,
subframe #F0 includes two slots #S0 and #S1.
[0051] The slot includes at least one OFDM symbol. Here, one slot
#S0 or #S1 includes 7 OFDM symbols.
[0052] One slot is divided into a plurality of blocks in a
frequency axis. A predetermined number of subcarriers constitute
one PRB as a unit in the frequency axis.
[0053] A unit constituted by one subcarrier and one OFDM symbol is
referred to as a resource element. A modulation symbol or the like
is mapped to each resource element by resource mapping processing
in a physical layer.
[0054] As described above, the PRBs are regions into which a
subframe, which is a transmission unit, is divided in a grid
pattern on two dimensions of the frequency and the time.
Hereinafter, the case where each PRB has a uniform bandwidth
W.sub.PRB in the frequency axis will be described. As shown in FIG.
1(b), a downlink reference signal A01 or a physical downlink
channel A02 is arranged in the PRB.
[0055] When one broadband system is operated by compositely using a
plurality of discontinuous bands W1 and W2 shown in FIG. 1(a), a
natural number of PRBs are arranged in each of the plurality of
bands W1 and W2 on the frequency axis in the first embodiment of
the present invention. FIGS. 1(a) and 1(b) show the case where the
system uses two downlink bands of the system band W1 and the system
band W2. N.sub.1 (N.sub.1 is a natural number) PRBs are arranged in
the system band W1, and N.sub.2 (N.sub.2 is a natural number) PRBs
are arranged in the system band W2.
[0056] For example, the bandwidth of one of the two system bands
allowed for the system is W1 and the bandwidth of the other system
band is W2. In a system in which a PRB bandwidth W.sub.PRB is set
to a fixed value, N1 is set to a natural number that is less than
or equal to (W.sub.1/W.sub.PRB), and N2 is set to a natural number
that is less than or equal to (W.sub.2/W.sub.PRB). Thereby, the
system bands are used so that N.sub.1 PRBs are arranged in a band
of N.sub.1W.sub.RPB within the W1 band and N.sub.2 PRBs are
arranged in a band of N.sub.2W.sub.RPB within the W2 band.
[0057] Alternatively, in a system in which a PRB bandwidth
W.sub.PRB is a parameter capable of being set for each base station
device (or each region), which is a transmitter, W.sub.PRB is set
as W1/N.sub.1 using a predetermined natural number N.sub.1 or is
set as W2/N.sub.2 using a predetermined natural number N.sub.2.
Here, W1 and W2 are use bandwidths considering guard bands.
[0058] FIG. 2 is a diagram showing a downlink channel configuration
used in the communication system according to the first embodiment
of the present invention. FIG. 3 is a diagram showing an uplink
channel configuration used in the communication system according to
the first embodiment of the present invention. Downlink channels
shown in FIG. 2 and uplink channels shown in FIG. 3 respectively
include logical channels, transport channels, and physical
channels.
[0059] The logical channel defines a type of data transmission
service to be transmitted/received to/from a medium access control
(MAC) layer. The transport channel defines what is a characteristic
of data to be transmitted by a radio interface and how data is
transmitted. The physical channel is a physical channel that
carries the transport channel.
[0060] The logical channels of the downlink include a broadcast
control channel (BCCH), a paging control channel (PCCH), a common
control channel (CCCH), a dedicated control channel (DCCH), a
dedicated traffic channel (DTCH), a multicast control channel
(MCCH), and a multicast traffic channel (MTCH).
[0061] The logical channels of the uplink include a CCCH, a DCCH,
and a DTCH.
[0062] The transport channels of the downlink include a broadcast
channel (BCH), a paging channel (PCH), a downlink shared channel
(DL-SCH), and a multicast channel (MCH).
[0063] The transport channels of the uplink include an uplink
shared channel (UL-SCH) and a random access channel (RACH).
[0064] The physical channels of the downlink include a PBCH, a
PDCCH, a PDSCH, a PMCH, a PCFICH, and a PHICH.
[0065] The physical channels of the uplink include a PUSCH, a
PRACH, and a PUCCH.
[0066] These channels are transmitted and received between the base
station device and the mobile station device as shown in FIG. 19
described in the related art.
[0067] Next, the logical channels will be described. The BCCH is a
downlink channel that is used to broadcast system control
information. The PCCH is a downlink channel that is used to
transmit paging information, and is used when a network does not
know a cell position of the mobile station device.
[0068] The CCCH is a channel that is used to transmit control
information between the mobile station device and the network, and
is used by the mobile station device that does not have a radio
resource control (RRC) connection with the network.
[0069] The DCCH is a point-to-point two-way channel that is used to
transmit individual control information between the mobile station
device and the network. The DCCH is used by the mobile station
device having the RRC connection.
[0070] The DTCH is a point-to-point two-way channel, and is used
for transmission of user information (unicast data) in a dedicated
channel of one mobile station device.
[0071] The MCCH is a downlink channel that is used for
point-to-multipoint transmission of multimedia broadcast multicast
service (MBMS) control information from the network to the mobile
station device. This is used for an MBMS service that provides a
point-to-multipoint service.
[0072] MBMS service transmission methods include single-cell
point-to-multipoint (SCPTM) transmission and multimedia broadcast
multicast service single frequency network (MBSFN)
transmission.
[0073] The MBSFN transmission is a simultaneous transmission
technique of simultaneously transmitting identifiable waveforms
(signals) from a plurality of cells. On the other hand, the SCPTM
transmission is a method of transmitting the MBMS service by one
base station device.
[0074] The MCCH is used in one or a plurality of MTCHs. The MTCH is
a downlink channel that is used for point-to-multipoint
transmission of traffic data (MBMS transmission data) from the
network to the mobile station device.
[0075] The MCCH and the MTCH are used only by a mobile station
device, which receives MBMS.
[0076] Next, the transport channels will be described. The BCH is
broadcast to the entire cell by a fixed and predefined transmission
format. In the DL-SCH, hybrid automatic repeat request (HARQ),
dynamic adaptive radio link control, discontinuous reception (DRX),
and MBMS transmission are supported and need to be broadcast to the
entire cell.
[0077] In the DL-SCH, beamforming is usable, and dynamic resource
allocation and quasi-static resource allocation are supported. In
the PCH, the DRX is supported and needs to be broadcast to the
entire cell.
[0078] The PCH is mapped to a physical resource that is dynamically
used for a traffic channel or another control channel, that is, the
PDSCH.
[0079] The MCH needs to be broadcast to the entire cell. In the
MCH, MBMS single frequency network (MBSFN) combining of MBMS
transmissions from a plurality of cells, allocation of a
quasi-static resource of a time frame using an extended cyclic
prefix (CP), or the like is supported.
[0080] In the UL-SCH, HARQ and dynamic adaptive radio link control
are supported. In the UL-SCH, beamforming is usable. Dynamic
resource allocation and quasi-static resource allocation are
supported. In the RACH, limited control information is transmitted
and a collision risk exists.
[0081] Next, the physical channels will be described. The PBCH is
mapped to the BCH at an interval of 40 milliseconds. Blind
detection of the timing of 40 milliseconds is applied. That is, for
timing presentation, explicit signaling may not be performed. A
subframe including the PBCH can be decoded only by the subframe.
That is, it is self-decodable.
[0082] The PDCCH is a channel that is used to notify a mobile
station device of PDSCH resource allocation, HARQ information for
downlink data, and uplink transmission permission (uplink grant) in
PUSCH resource allocation.
[0083] The PDSCH is a channel that is used to transmit downlink
data or paging information. The PMCH is a channel that is used to
transmit the MCH. A downlink reference signal, an uplink reference
signal, and a physical downlink synchronization signal are
separately arranged.
[0084] The PUSCH is a channel that is used to mainly transmit the
UL-SCH. When the base station device 100 schedules the mobile
station device 200, a channel feedback report (a downlink channel
quality indicator (CQI), a precoding matrix indicator (PMI), or a
rank indicator (RI)) or an HARQ acknowledgement (ACK)/negative
acknowledgement (NACK) to downlink transmission is also transmitted
using the PUSCH.
[0085] The PRACH is a channel that is used to transmit a random
access preamble, and has a guard time. The PUCCH is a channel that
is used to transmit the channel feedback report (CQI, PMI, and RI),
a scheduling request (SR), an HARQ ACK/NACK to the downlink
transmission, and the like.
[0086] The PCFICH is a channel that is used to notify the mobile
station device of the number of OFDM symbols used for the PDCCH,
and is transmitted in each subframe.
[0087] The PHICH is a channel that is used to transmit an HARQ
ACK/NACK to uplink transmission.
[0088] Next, channel mapping by the communication system according
to the first embodiment of the present invention will be
described.
[0089] As shown in FIG. 2, mapping of the transport channel and the
physical channel is performed in the downlink as follows. The BCH
is mapped to the PBCH.
[0090] The MCH is mapped to the PMCH. The PCH and the DL-SCH are
mapped to the PDSCH.
[0091] The PDCCH, the PHICH, and the PCFICH are independently used
as the physical channels.
[0092] On the other hand, in the uplink, mapping of the transport
channel and the physical channel is performed as follows. The
UL-SCH is mapped to the PUSCH.
[0093] The RACH is mapped to the PRACH. The PUCCH is independently
used as the physical channel.
[0094] In the downlink, mapping of the logical channel and the
transport channel is performed as follows. The PCCH is mapped to
the DL-SCH.
[0095] The BCCH is mapped to the BCH and the DL-SCH. The CCCH, the
DCCH, and the DTCH are mapped to the DL-SCH.
[0096] The MCCH is mapped to the DL-SCH and the MCH. The MTCH is
mapped to the DL-SCH and the MCH.
[0097] Mapping from the MCCH and the MTCH to the MCH is performed
upon MBSFN transmission. On the other hand, this mapping is mapped
to the DL-SCH upon SCPTM transmission.
[0098] On the other hand, in the uplink, mapping of the logical
channel and the transport channel is performed as follows. The
CCCH, the DCCH, and the DTCH are mapped to the UL-SCH. The RACH is
not mapped to the logical channel.
[0099] Next, a frame structure used in the radio communication
system according to the first embodiment of the present invention
will be described.
[0100] FIG. 4 is a diagram showing a frame structure used in the
downlink of the radio communication system according to the first
embodiment of the present invention. FIG. 5 is a diagram showing a
frame structure used in the uplink of the radio communication
system according to the first embodiment of the present invention.
In FIGS. 4 and 5, the horizontal axis represents a time and the
vertical axis represents a frequency.
[0101] A radio frame to be identified by a system frame number
(SFN) is constituted by 10 milliseconds (10 ms). One subframe is
constituted by 1 millisecond (1 ms). The radio frame includes 10
subframes #F0 to #F09.
[0102] As shown in FIG. 4, a PCFICH A11, a PHICH A12, a PDCCH A13,
a physical downlink synchronization signal A14, a PBCH A15, a
PDSCH/PMCH A16, and a downlink reference signal A17 are arranged in
the radio frame that is used in the downlink.
[0103] As shown in FIG. 5, a PRACH A21, a PUCCH A22, a PUSCH A23,
an uplink demodulation reference signal A24, and an uplink
measurement reference signal A25 are arranged in the radio frame
that is used in the uplink.
[0104] One subframe (for example, subframe #F0) is separated into
two slots #S0 and #S1. When a normal CP is used, a downlink slot
includes 7 OFDM symbols (see FIG. 4), and an uplink slot includes 7
single carrier-frequency division multiple access (SC-FDMA) symbols
(see FIG. 5).
[0105] If an extended CP (also referred to as a long CP) is used,
the downlink slot includes 6 OFDM symbols and the uplink slot
includes 6 SC-FDMA symbols.
[0106] One slot is divided into a plurality of blocks in the
frequency axis. One PRB is constituted using twelve 15-kHz
subcarriers as a unit in the frequency axis. In response to a
system bandwidth, 6 to 110 PRBs are supported. FIGS. 4 and 5 show
the case where the number of PRBs is 25. In the uplink and the
downlink, different system bandwidths may be used. By the
aggregation, the entire system bandwidth may be 110 or more
PRBs.
[0107] Resource allocations of the downlink and the uplink are
performed in a subframe unit in a time axis and in a PRB unit in
the frequency axis. That is, two slots within a subframe are
allocated in one resource allocation signal.
[0108] A unit constituting a subcarrier and an OFDM symbol or a
unit constituting a subcarrier and an SC-FDMA symbol is referred to
as a resource element. In resource mapping processing of a physical
layer, a modulation symbol or the like is mapped to each resource
element.
[0109] In processing of a physical layer of the downlink transport
channel, the assignment of 24-bit cyclic redundancy check (CRC) to
the PDSCH, channel coding (transmission channel coding),
physical-layer HARQ processing, channel interleaving, scrambling,
modulation (quadrature phase shift keying (QPSK), 16 quadrature
amplitude modulation (16QAM), or 64QAM), layer mapping, precoding,
resource mapping, antenna mapping, and the like are performed.
[0110] On the other hand, in processing of a physical layer of the
uplink transport channel, the assignment of 24-bit CRC to the
PUSCH, channel coding (transmission channel coding), physical-layer
HARQ processing, scrambling, modulation (QPSK, 16QAM, or 64QAM),
resource mapping, antenna mapping, and the like are performed.
[0111] The PDCCH, the PHICH, and the PCFICH are arranged in first 3
or fewer OFDM symbols.
[0112] In the PDCCH, transport format, resource allocation, and
HARQ information for the DL-SCH and the PCH is transmitted. The
transport format prescribes a modulation scheme, a coding scheme, a
transport block size, and the like.
[0113] In the PDCCH, transport format, resource allocation, and
HARQ information for the UL-SCH is transmitted.
[0114] A plurality of PDCCHs are supported, and the mobile station
device monitors a set of PDCCHs.
[0115] The PDSCH allocated by the PDCCH is mapped to the same
subframe as that of the PDCCH.
[0116] The PUSCH allocated by the PDCCH is mapped to a subframe of
a predefined position. For example, if a downlink subframe number
of the PDCCH is N, it is mapped to uplink subframe No. N+4.
[0117] In uplink/downlink resource allocation by the PDCCH, the
mobile station device is specified using 16-bit MAC-layer
identification information (MAC ID). That is, the 16-bit MAC ID is
included in the PDCCH.
[0118] A downlink reference signal (downlink pilot channel) to be
used for measurement of a downlink state and demodulation of
downlink data is arranged in first and second OFDM symbols of each
slot and a third OFDM symbol from behind.
[0119] On the other hand, an uplink demodulation reference signal
(a demodulation pilot (demodulation reference signal: DRS)) to be
used for demodulation of the PUSCH is transmitted in a fourth
SC-FDMA symbol of each slot.
[0120] An uplink measurement reference signal (a scheduling pilot
(sounding reference signal: SRS)) to be used for measurement of an
uplink state is transmitted in a last SC-FDMA symbol of a
subframe.
[0121] A PUCCH demodulation reference signal is defined in each
physical uplink control channel format, and is transmitted in
third, fourth and fifth SC-FDMA symbols of each slot or second and
sixth SC-FDMA symbols of each slot.
[0122] The PBCH and the downlink synchronization signal are
arranged in a band of 6 physical resource blocks in the center of
the system band. The physical downlink synchronization signal is
transmitted in sixth and seventh OFDM symbols of each slot of
subframes of a first subframe (subframe #F0) and a fifth subframe
(subframe #F4).
[0123] The PBCH is transmitted in fourth and fifth OFDM symbols of
the first slot (slot #S0) and first and second OFDM symbols of the
second slot (slot #S1) of the first subframe (subframe #F0).
[0124] The PRACH is constituted by a bandwidth of 6 physical
resource blocks in the frequency axis and 1 subframe in the time
axis. The PRACH is transmitted for requests (an uplink resource
request, an uplink synchronization request, a downlink data
transmission resumption request, a handover request, a connection
setup request, a reconnection request, an MBMS service request, and
the like) on various reasons from the mobile station device to the
base station device.
[0125] The PUCCH is arranged in two ends of the system band and is
constituted in a PRB unit. Frequency hopping is performed so that
the two ends of the system band are alternately used between
slots.
[0126] FIG. 6 is a schematic block diagram showing a configuration
of the base station device 100 according to the first embodiment of
the present invention. The base station device 100 includes a data
control unit 101a, an OFDM modulation unit 102a, a radio unit 103a,
a scheduling unit 104, a channel estimation unit 105, a DFT-S-OFDM
(DFT-Spread-OFDM) demodulation unit 106, a data extraction unit
107, an upper layer 108, and an antenna unit A1.
[0127] The radio unit 103a, the scheduling unit 104, the channel
estimation unit 105, the DFT-S-OFDM demodulation unit 106, the data
extraction unit 107, the upper layer 108, and the antenna unit A1
constitute a reception unit. The data control unit 101a, the OFDM
modulation unit 102a, the radio unit 103a, the scheduling unit 104,
the upper layer 108, and the antenna unit A1 constitute a
transmission unit.
[0128] The antenna unit A1, the radio unit 103a, the channel
estimation unit 105, the DFT-S-OFDM demodulation unit 106, and the
data extraction unit 107 perform processing of the physical layer
of the uplink. The antenna unit A2, the data control unit 101a, the
OFDM modulation unit 102a, and the radio unit 103a perform
processing of the physical layer of the downlink.
[0129] The data control unit 101a acquires the transport channel
from the scheduling unit 104. The data control unit 101a maps the
transport channel and a signal and a channel generated in the
physical layer based on scheduling information input from the
scheduling unit 104 to the physical channel based on the scheduling
information input from the scheduling unit 104. Data mapped as
described above is output to the OFDM modulation unit 102a.
[0130] The OFDM modulation unit 102a performs OFDM signal
processing such as coding, data modulation, serial/parallel
conversion of an input signal, inverse fast Fourier transform
(IFFT) processing, CP insertion, filtering, and the like for data
input from the data control unit 101a based on the scheduling
information (including downlink PRB allocation information
(including, for example, PRB position information such as a
frequency and a time), a modulation scheme and a coding scheme (for
example, 16QAM modulation and a 2/3 coding rate) corresponding to
each downlink PRB, or the like) input from the scheduling unit 104,
generates an OFDM signal, and outputs the OFDM signal to the radio
unit 103a.
[0131] The radio unit 103a generates a radio signal by
up-converting modulation data input from the OFDM modulation unit
102a into a radio frequency, and transmits the radio signal to the
mobile station device 200 (see FIG. 7 to be described later) via
the antenna unit A1. The radio unit 103a receives an uplink radio
signal from the mobile station device 200 via the antenna unit A1,
down-converts the uplink radio signal into a baseband signal, and
outputs reception data to the channel estimation unit 105 and the
DFT-S-OFDM demodulation unit 106.
[0132] The scheduling unit 104 performs processing of the MAC
(Medium Access Control) layer. The scheduling unit 104 performs
mapping of the logical channel and the transport channel, downlink
and uplink scheduling (HARQ processing, transport format selection,
and the like), and the like. Since the scheduling unit 104
integrates and controls processing units of the physical layers,
interfaces are provided between the scheduling unit 104 and the
antenna unit A1, the radio unit 103a, the channel estimation unit
105, the DFT-S-OFDM demodulation unit 106, the data control unit
101a, the OFDM modulation unit 102a, and the data extraction unit
107. However, their illustration is omitted in FIG. 6.
[0133] In downlink scheduling, the scheduling unit 104 generates
scheduling information to be used in processing of selection of a
downlink transport format (transmission format) (PRB allocation and
modulation schemes, a coding scheme, and the like) for modulating
data, retransmission control in the HARQ, and the downlink
scheduling based on feedback information (a downlink channel
feedback report (channel quality (CQI), the number of streams (RI),
precoding information (PMI), and the like)), ACK/NACK feedback
information for downlink data, or the like) received from the
mobile station device 200, information of available downlink PRBs
of each mobile station device, a buffer situation, scheduling
information input from the upper layer 108, and the like. The
scheduling information that is used in the downlink scheduling is
output to the data control unit 101a and the data extraction unit
107.
[0134] In uplink scheduling, the scheduling unit 104 generates
scheduling information to be used in processing of selection of an
uplink transport format (transmission format) (PRB allocation and
modulation schemes, a coding scheme, and the like) for modulating
data and the uplink scheduling based on an estimation result of an
uplink channel state (radio propagation channel state) output by
the channel estimation unit 105, a resource allocation request from
the mobile station device 200, information of available PRBs of
each mobile station device 200, scheduling information input from
the upper layer 108, and the like.
[0135] The scheduling information that is used in the uplink
scheduling is output to the data control unit 101a and the data
extraction unit 107.
[0136] The scheduling unit 104 maps the logical channel of the
downlink input from the upper layer 108 to the transport channel,
and outputs a mapping result to the data control unit 101a. Also,
the scheduling unit 104 processes control data and the transport
channel acquired in the uplink input from the data extraction unit
107 if necessary, maps a processing result to the logical channel
of the uplink, and outputs a mapping result to the upper layer
108.
[0137] The channel estimation unit 105 estimates an uplink channel
state from an uplink DRS for uplink data demodulation, and outputs
an estimation result to the DFT-S-OFDM demodulation unit 106. Also,
to perform the uplink scheduling, the uplink channel state is
estimated from an uplink SRS and an estimation result is output to
the scheduling unit 104.
[0138] An uplink communication scheme is assumed to be a single
carrier scheme such as DFT-S-OFDM or the like, but a multi-carrier
scheme such as an OFDM scheme may be used.
[0139] Based on the uplink channel state estimation result input
from the channel estimation unit 105, the DFT-S-OFDM demodulation
unit 106 performs demodulation processing by performing DFT-S-OFDM
signal processing such as discrete Fourier transform (DFT)
conversion, subcarrier mapping, IFFT conversion, filtering, and the
like for modulation data input from the radio unit 103a, and
outputs a processing result to the data extraction unit 107.
[0140] Based on the scheduling information from the scheduling unit
104, the data extraction unit 107 checks the accuracy of data input
from the DFT-S-OFDM demodulation unit 106, and outputs a check
result (acknowledgment signal ACK/negative acknowledgement signal
NACK) to the scheduling unit 104.
[0141] Also, based on the scheduling information input from the
scheduling unit 104, the data extraction unit 107 separates the
transport channel and the control data of the physical layer from
data input from the DFT-S-OFDM demodulation unit 106, and outputs
the transport channel and the control data to the scheduling unit
104.
[0142] The separated control data includes feedback information (a
downlink channel feedback report (CQI, PMI, and RI) and ACK/NACK
feedback information for downlink data) reported from the mobile
station device 200, and the like.
[0143] The upper layer 108 performs processing of a packet data
convergence protocol (PDCP) layer, a radio link control (RLC)
layer, and a radio resource control (RRC) layer. Since the upper
layer 108 integrates and controls processing units of the lower
layers, interfaces are provided between the upper layer 108 and the
scheduling unit 104, the antenna unit A1, the radio unit 103a, the
channel estimation unit 105, the DFT-S-OFDM demodulation unit 106,
the data control unit 101a, the OFDM modulation unit 102a, and the
data extraction unit 107. However, their illustration is omitted in
FIG. 6.
[0144] The upper layer 108 has a radio resource control unit 109.
The radio resource control unit 109 performs management of various
types of setting information, management of system information,
paging control, management of a communication state of each mobile
station device, mobility management of a handover and the like,
management of a buffer situation of each mobile station device,
management of connection setup of unicast and multicast bearers,
management of a mobile station identifier (UEID), and the like. The
upper layer 108 transmits/receives information directed to another
base station device and information directed to an upper node.
[0145] FIG. 7 is a schematic block diagram showing a configuration
of the mobile station device 200 according to the first embodiment
of the present invention. The mobile station device 200 includes a
data control unit 201, a DFT-S-OFDM modulation unit 202, a radio
unit 203a, a scheduling unit 204, a channel estimation unit 205a,
an OFDM demodulation unit 206a, a data extraction unit 207a, an
upper layer 208, and an antenna unit A2.
[0146] The data control unit 201, the DFT-S-OFDM modulation unit
202, the radio unit 203a, the scheduling unit 204, the upper layer
208, and the antenna unit A2 constitute a transmission unit. The
radio unit 203a, the scheduling unit 204, the channel estimation
unit 205a, the OFDM demodulation unit 206a, the data extraction
unit 207a, the upper layer 208, and the antenna unit A2 constitute
a reception unit. The scheduling unit 204 constitutes a selection
unit.
[0147] The antenna unit A2, the data control unit 201, the
DFT-S-OFDM modulation unit 202, and the radio unit 203a perform
processing of the physical layer of the uplink. The antenna unit
A2, the radio unit 203a, the channel estimation unit 205a, the OFDM
demodulation unit 206a, and the data extraction unit 207a perform
processing of the physical layer of the downlink.
[0148] The data control unit 201 acquires the transport channel
from the scheduling unit 204. The data control unit 201 maps the
transport channel and a signal and a channel generated in the
physical layer based on scheduling information input from the
scheduling unit 204, to the physical channel. The data mapped as
described above is output to the DFT-S-OFDM modulation unit
202.
[0149] The DFT-S-OFDM modulation unit 202 performs DFT-S-OFDM
signal processing such as data modulation, DFT processing,
subcarrier mapping, IFFT processing, CP insertion, filtering, and
the like, generates a DFT-S-OFDM signal, and outputs the DFT-S-OFDM
signal to the radio unit 203a.
[0150] An uplink communication scheme is assumed to be a single
carrier scheme such as DFT-S-OFDM or the like, but a multi-carrier
scheme such as an OFDM scheme may be used in place thereof
[0151] The radio unit 203a generates a radio signal by
up-converting modulation data input from the DFT-S-OFDM modulation
unit 202 into a radio frequency, and transmits the radio signal to
the base station device 100 (FIG. 6) via the antenna unit A2.
[0152] The radio unit 203a receives a radio signal modulated by
downlink data from the base station device 100 via the antenna unit
A2, down-converts the radio signal into a baseband signal, and
outputs reception data to the channel estimation unit 205a and the
OFDM demodulation unit 206a.
[0153] The scheduling unit 204 performs processing of the MAC
layer. The scheduling unit 204 performs mapping of the logical
channel and the transport channel, downlink and uplink scheduling
(HARQ processing, transport format selection, and the like), and
the like. Since the scheduling unit 104 integrates and controls
processing units of the physical layers, interfaces are provided
between the scheduling unit 104 and the antenna unit A2, the data
control unit 201, the DFT-S-OFDM modulation unit 202, the channel
estimation unit 205a, the OFDM demodulation unit 206a, the data
extraction unit 207a, and the radio unit 203a. However, their
illustration is omitted in FIG. 7.
[0154] In downlink scheduling, the scheduling unit 204 generates
scheduling information to be used in reception control of the
transport channel, the physical signal, and the physical channel,
HARQ retransmission control, and the downlink scheduling based on
scheduling information (transport format or HARQ retransmission
information) and the like from the base station device 100 or the
upper layer 208. The scheduling information that is used in the
downlink scheduling is output to the data control unit 201 and the
data extraction unit 207a.
[0155] In uplink scheduling, the scheduling unit 204 generates
scheduling information to be used in scheduling processing for
mapping the logical channel of the uplink input from the upper
layer 208 to the transport channel and the uplink scheduling based
on a buffer situation of the uplink input from the upper layer 208,
uplink scheduling information from the base station device 100
input from the data extraction unit 207a, scheduling information
input from the upper layer 208, and the like. The scheduling
information is transport format or HARQ retransmission information,
and the like.
[0156] In the uplink transport format, information reported from
the base station device 100 is used. The scheduling information is
output to the data control unit 201 and the data extraction unit
207a.
[0157] The scheduling unit 204 maps the logical channel of the
uplink input from the upper layer 208 to the transport channel, and
outputs a mapping result to the data control unit 201. The
scheduling unit 204 also outputs a downlink channel feedback report
(CQI, PMI, and RI) input from the channel estimation unit 205a or a
CRC check result input from the data extraction unit 207a to the
data control unit 201.
[0158] Also, the scheduling unit 204 processes the control data and
the transport channel acquired in the downlink input from the data
extraction unit 207a if necessary, maps a processing result to the
logical channel of the downlink, and outputs a mapping result to
the upper layer 208.
[0159] The channel estimation unit 205a estimates a downlink
channel state from a downlink reference signal (RS) for downlink
data modulation, and outputs an estimation result to the OFDM
demodulation unit 206a.
[0160] The channel estimation unit 205a estimates a downlink
channel state from the downlink RS so as to notify the base station
device 100 of an estimation result of the downlink channel state
(radio propagation channel state), converts an estimation result
into a downlink channel feedback report (channel quality
information and the like), and outputs the downlink channel
feedback report to the scheduling unit 204.
[0161] The OFDM demodulation unit 206a performs OFDM demodulation
processing for modulation data input from the radio unit 203a based
on the downlink channel state estimation result input from the
channel estimation unit 205a, and outputs a processing result to
the data extraction unit 207a.
[0162] The data extraction unit 207a performs CRC for data input
from the OFDM demodulation unit 206a, checks accuracy, and outputs
a check result (ACK/NACK feedback information) to the scheduling
unit 204.
[0163] The data extraction unit 207a separates the transport
channel and the control data of the physical layer from data input
from the OFDM demodulation unit 206a based on the scheduling
information from the scheduling unit 204, and outputs the transport
channel and the control data to the scheduling unit 204. The
separated control data includes scheduling information such as
downlink or uplink resource allocation or uplink HARQ control
information. At this time, a search space (also referred to as a
search region) of the PDCCH is decoded and downlink or uplink
resource allocation or the like destined for its own station is
extracted.
[0164] The upper layer 208 performs processing of the PDCP layer,
the RLC layer, and the RRC layer. The upper layer 208 has a radio
resource control unit 209. Since the upper layer 208 integrates and
controls processing units of the lower layers, interfaces are
provided between the upper layer 208 and the scheduling unit 204,
the antenna unit A2, the data control unit 201, the DFT-S-OFDM
modulation unit 202, the channel estimation unit 205a, the OFDM
demodulation unit 206a, the data extraction unit 207a, and the
radio unit 203a. However, their illustration is omitted in FIG.
7.
[0165] The radio resource control unit 209 performs management of
various types of setting information, management of system
information, paging control, management of a communication state of
its own station, mobility management of a handover and the like,
management of a buffer situation, management of connection setup of
unicast and multicast bearers, and management of a mobile station
identifier (UEID).
[0166] FIG. 8 is a schematic block diagram showing configurations
of the data control unit 101a, the OFDM modulation unit 102a, and
the radio unit 103a related to the transmission unit of the base
station device 100 (FIG. 6) according to the first embodiment of
the present invention. Here, the case where frequency aggregation
is applied to the downlink in the base station device 100 (FIG. 6)
will be described.
[0167] The data control unit 101a includes the physical mapping
unit 301, the reference signal generation unit 302, and the
synchronization signal generation unit 303. The reference signal
generation unit 302 generates a downlink reference signal and
outputs the downlink reference signal to the physical mapping unit
301. The synchronization signal generation unit 303 generates a
synchronization signal and outputs the synchronization signal to
the physical mapping unit 301.
[0168] The physical mapping unit 301 maps the transport channel to
PRBs based on the scheduling information, and multiplexes the
reference signal generated in the reference signal generation unit
302 and the synchronization signal generated in the synchronization
signal generation unit 303 into a physical frame.
[0169] At this time, the scheduling information includes
information related to a system bandwidth. The physical mapping
unit 301 maps the transport channel to PRBs arranged in the band of
N.sub.1W.sub.PRB within the system band W1 and PRBs arranged in the
band of N.sub.2W.sub.PRB within the system band W2, and inserts a
null signal into subcarriers of a band other than the system bands
W1 and W2 and a guard band. The physical mapping unit 301 maps the
PBCH including information related to the system bandwidth.
[0170] The OFDM modulation unit 102a includes a modulation unit
304, an IFFT unit 305, and a CP insertion unit 306.
[0171] The modulation unit 304 generates a modulation symbol by
modulating information mapped to each resource element of a
physical frame based on a modulation scheme of QPSK
modulation/16QAM modulation/64QAM modulation, or the like, and
outputs the modulation symbol to the IFFT unit 305.
[0172] The IFFT unit 305 transforms a frequency domain signal into
a time domain signal by performing IFFT for the modulation symbol
(a modulation symbol arranged on a plane in the frequency axis and
the time axis) generated in the modulation unit 304, and outputs
the time domain signal to the CP insertion unit 306.
[0173] The CP insertion unit 306 generates an OFDM symbol by
inserting a CP into the time domain signal, and outputs the OFDM
symbol to the D/A conversion unit 307 of the radio unit 103a.
[0174] The radio unit 103a includes a D/A conversion unit 307 and a
radio transmission unit 308.
[0175] The D/A conversion unit 307 converts an OFDM symbol sequence
of an output of the CP insertion unit 306, which is a digital
signal, into an analog signal, and outputs the analog signal to the
radio transmission unit 308.
[0176] The radio transmission unit 308 up-converts the analog
signal into a radio frequency with use of a carrier frequency f
shown in FIG. 9, and transmits the generated signal to the mobile
station device 200 (FIG. 7) via the antenna unit A1. In FIG. 9, the
horizontal axis represents a frequency. FIG. 9 shows the case where
a signal is transmitted from the base station device 100 to the
mobile station device 200 with use of the system band W1 and the
system band W2.
[0177] FIG. 10 is a schematic block diagram showing configurations
of the radio unit 203a, the channel estimation unit 205a, the OFDM
demodulation unit 206a, and the data extraction unit 207a related
to the reception unit of the mobile station device 200 (FIG. 7)
according to the first embodiment of the present invention. Here,
the case where frequency aggregation is applied to the downlink in
the mobile station device 200 will be described.
[0178] The radio unit 203a includes a radio reception unit 401 and
an A/D conversion unit 402.
[0179] The radio reception unit 401 receives a signal from the base
station device 100 (FIG. 6) via the antenna unit A2, and
down-converts the received signal into a baseband with use of a
carrier frequency f shown in FIG. 9. Also, the radio reception unit
401 acquires synchronization by referring to a synchronization
signal inserted in advance into a signal by cell selection or
reselection processing, and sets up and establishes a connection in
the system bands W1 and W2 with use of information regarding the
system bands reported from the scheduling unit 104 or the upper
layer. The radio reception unit 401 uses an output of the A/D
conversion unit 402 when synchronization is acquired using a
digital signal.
[0180] The A/D conversion unit 402 converts an analog signal of the
output of the radio reception unit 401 into a digital signal, and
outputs the digital signal to the channel estimation unit 205a and
the CP removal unit 403 of the OFDM demodulation unit 206a.
[0181] The OFDM demodulation unit 206a includes a CP removal unit
403, an FFT unit 404, and a demodulation unit 405. The CP removal
unit 403 removes a CP part from the digital signal output from the
A/D conversion unit 402.
[0182] A time domain signal from which the CP is removed in the CP
removal unit 403 is transformed into a modulation symbol (a
modulation symbol arranged on a plane in the frequency axis and the
time axis) of resource elements in the FFT unit 404.
[0183] The demodulation unit 405 performs demodulation processing,
which corresponds to the modulation scheme used in the modulation
unit 304, for the modulation symbol into which the transformation
is performed while referring to a propagation channel estimation
value estimated in the propagation channel estimation unit 205a,
and acquires a bit sequence (or bit likelihood information or the
like).
[0184] If data extraction is prepared and set using information
within the PBCH by cell selection or reselection processing, the
data extraction unit 207a extracts broadcast information from PRBs
of a band including the PBCH, and prepares and sets the data
extraction in the system bands W1 and W2.
[0185] Alternatively, once the scheduling unit 104 is notified of
the broadcast information or the upper layer is notified of the
broadcast information via the scheduling unit 104, the data
extraction is set in the system bands W1 and W2 based on
instructions thereof. At this time, the scheduling unit 104 or the
upper layer notifies the radio reception unit 401 of information
regarding the system bands.
[0186] If data for which data extraction is already set in the
system bands W1 and W2 is received (normal communication is
performed), the data extraction unit 207a maps PRBs to the
transport channel. At this time, the data extraction unit 207a
removes a signal in subcarriers of a band other than the system
bands W1 and W2 and a guard band, and maps PRBs arranged in a band
of N.sub.1W.sub.PRB within the system band W1 and PRBs arranged in
a band of N.sub.2W.sub.PRB within the system band W2 to the
transport channel.
[0187] As a modified example of the first embodiment, the
configuration of the base station device shown in FIG. 12 or the
configuration of the mobile station device shown in FIG. 13 may be
used. In this regard, if this configuration is used, carrier
frequencies f'1 and f'2 as shown in FIG. 11 are used.
[0188] FIG. 11 is a diagram showing an example of bands used in the
radio communication system according to the first embodiment of the
present invention. In FIG. 11, the horizontal axis represents a
frequency. In this modified example, a signal is transmitted from
the base station device to the mobile station device with use of
frequencies of system bands W'1 and W'2. The carrier frequency of
the system band W'1 is f'1 and the carrier frequency of the system
band W'2 is f'2.
[0189] The base station device may transmit a signal to the mobile
station device with use of only one system band. In this case, it
is preferable to use a configuration like the base station device
100 (FIG. 6) of the first embodiment. A configuration like the
configuration shown in FIG. 4 can be used as a subframe structure
related to this modified example.
[0190] The PBCH that is a channel including a synchronization
signal, which is a signal for synchronization, and physical
broadcast information is inserted into any one (here, the system
band W'1) of the system bands.
[0191] The mobile station device first acquires frame
synchronization by searching for the synchronization signal, and
also acquires information within the PBCH. Information (information
regarding an aggregation resource region including the system band
W'2) indicating a system band is included in the information within
the PBCH. The system bands W'1 and W'2 are received using the
information.
[0192] At this time, N.sub.1 PRBs are arranged in the system band
W'1 and N.sub.2 PRBs are arranged in the system band W'2. Thereby,
a propagation channel characteristic in the inside of the PRB
becomes continuous in any PRB. Thus, it is possible to prevent the
degradation of accuracy of propagation channel estimation or
reception quality measurement.
[0193] FIG. 12 is a schematic block diagram showing configurations
of a data control unit 101b, an OFDM modulation unit 102b, and a
radio unit 103b of the base station device according to a modified
example of the first embodiment of the present invention. Here, the
case where frequency aggregation is applied to the downlink in the
base station device will be described.
[0194] The base station device according to the modified example of
the first embodiment includes the data control unit 101b, the OFDM
modulation unit 102b, and the radio unit 103b in place of the data
control unit 101a, the OFDM modulation unit 102a, and the radio
unit 103a (FIG. 8) of the base station device 100 according to the
first embodiment.
[0195] The data control unit 101b includes a physical mapping unit
501, a reference signal generation unit 502, and a synchronization
signal generation unit 503.
[0196] The reference signal generation unit 502 generates a
downlink reference signal and outputs the downlink reference signal
to the physical mapping unit 5011. The synchronization signal
generation unit 503 generates a synchronization signal and outputs
the synchronization signal to the physical mapping unit 501. The
physical mapping unit 501 maps the transport channel to PRBs based
on scheduling information, and also multiplexes the reference
signal generated in the reference signal generation unit 502 and
the synchronization signal generated in the synchronization signal
generation unit 503 into a physical frame.
[0197] At this time, information related to system bandwidths W'1
and W'2 is included in the scheduling information. The physical
mapping unit 501 maps the transport channel to PRBs arranged in a
band of N.sub.1W.sub.PRB within the system band W'1 and PRBs
arranged in a band of N.sub.2W.sub.PRB within the system band
W'2.
[0198] The OFDM modulation unit 102b includes modulation units
504-1 and 504-2, IFFT units 505-1 and 505-2, and CP insertion units
506-1 and 506-2.
[0199] The modulation unit 504-1, the IFFT unit 505-1, and the CP
insertion unit 506-1 process the PRBs arranged in the band of
N.sub.1W.sub.PRB within the system band W'1.
[0200] The modulation unit 504-1 generates a modulation symbol by
modulating information mapped to each resource element of a
physical frame based on a modulation scheme of QPSK modulation,
16QAM modulation, 64QAM modulation, or the like, and outputs the
modulation symbol to the IFFT unit 505-1.
[0201] The IFFT unit 505-1 transforms a frequency domain signal
into a time domain signal by performing IFFT for the modulation
symbol (a modulation symbol arranged on a plane in the frequency
axis and the time axis) generated in the modulation unit 504-1, and
outputs the time domain signal to the CP insertion unit 506-1.
[0202] The CP insertion unit 506-1 generates an OFDM symbol by
inserting a CP into the time domain signal, and outputs the OFDM
symbol to a D/A conversion unit 507-1 of the radio unit 103b.
[0203] The modulation unit 504-2, the IFFT unit 505-2, and the CP
insertion unit 506-2 process the PRBs arranged in the band of
N.sub.2W.sub.PRB within the system band W'2. The modulation unit
504-2 generates a modulation symbol by modulating information
mapped to each resource element of a physical frame based on a
modulation scheme of QPSK modulation, 16QAM modulation, 64QAM
modulation, or the like, and outputs the modulation symbol to the
IFFT unit 505-2.
[0204] The IFFT unit 505-2 transforms a frequency domain signal
into a time domain signal by performing IFFT for the modulation
symbol (a modulation symbol arranged on a plane in the frequency
axis and the time axis) generated in the modulation unit 504-2, and
outputs the time domain signal to the CP insertion unit 506-2.
[0205] The CP insertion unit 506-2 generates an OFDM symbol by
inserting a CP into the time domain signal, and outputs the OFDM
symbol to a D/A conversion unit 507-2 of the radio unit 103b.
[0206] The radio unit 103b includes the D/A conversion units 507-1
and 507-2 and radio transmission units 508-1 and 508-2.
[0207] The D/A conversion unit 507-1 and the radio transmission
unit 508-1 process the PRBs arranged in the band of
N.sub.1W.sub.PRB within the system band W'1.
[0208] The D/A conversion unit 507-1 converts an OFDM symbol
sequence of an output of the CP insertion unit 506-1, which is a
digital signal, into an analog signal, and outputs the analog
signal to the radio transmission unit 508-1.
[0209] The radio transmission unit 508-1 up-converts the analog
signal into a radio frequency with use of a carrier frequency W'1
shown in FIG. 11, and transmits the generated signal to the mobile
station device via the antenna unit A1.
[0210] The D/A conversion unit 507-2 and the radio transmission
unit 508-2 process the PRBs arranged in the band of
N.sub.2W.sub.PRB within the system band W'2.
[0211] The D/A conversion unit 507-2 converts an OFDM symbol
sequence of an output of the CP insertion unit 506-2, which is a
digital signal, into an analog signal, and outputs the analog
signal to the radio transmission unit 508-2.
[0212] The radio transmission unit 508-2 up-converts the analog
signal into a radio frequency with use of a carrier frequency W'2
shown in FIG. 11, and transmits the generated signal to the mobile
station device via the antenna unit A1.
[0213] Here, blocks divided to perform the same processing for
different signals have been described, but one circuit may be
shared.
[0214] FIG. 13 is a schematic block diagram showing configurations
of a radio unit 203b, a channel estimation unit 205b, an OFDM
demodulation unit 206b, and a data extraction unit 207b of the
mobile station device according to the modified example of the
first embodiment of the present invention. Here, the case where
frequency aggregation is applied to the downlink in the mobile
station device will be described.
[0215] In FIG. 13, a signal output by a band-specific channel
estimation unit 603-1 is input to a demodulation unit 606-1. A
signal output by a band-specific channel estimation unit 603-2 is
input to a demodulation unit 606-2.
[0216] The mobile station device according to the modified example
of the first embodiment includes the radio unit 203b, the channel
estimation unit 205b, the OFDM demodulation unit 206b, and the data
extraction unit 207b in place of the radio unit 203a, the channel
estimation unit 205a, the OFDM demodulation unit 206a, and the data
extraction unit 207a (FIG. 10) of the mobile station device 200
according to the first embodiment.
[0217] The radio unit 203b includes radio reception units 601-1 and
601-2 and A/D conversion units 602-1 and 602-2.
[0218] The radio reception unit 601-1 receives a signal from the
base station device via the antenna unit A2, and down-converts the
received signal into a baseband with use of the carrier frequency
f'1 shown in FIG. 11. Also, the radio reception unit 601-1 acquires
synchronization by referring to a synchronization signal inserted
in advance into a signal by cell selection or reselection
processing, and sets up and establishes a connection in the system
band W'1 with use of information regarding the system band reported
from the scheduling unit 204 or the upper layer. The radio
reception unit 601-1 uses an output of the A/D conversion unit
602-1 described below when synchronization is acquired using a
digital signal.
[0219] The A/D conversion unit 602-1 converts an analog signal of
an output of the radio reception unit 601-1 into a digital signal,
and outputs the digital signal to the band-specific channel
estimation unit 603-1 of the channel estimation unit 205b and the
CP removal unit 604-1 of the OFDM demodulation unit 206b.
[0220] The radio reception unit 601-2 sets up and establishes a
connection in the system band W'2 with use of information regarding
the system band reported from the scheduling unit 204 or the upper
layer, receives a signal from the base station device via the
antenna unit A2, down-converts the received signal into a baseband
with use of the carrier frequency f'2 shown in FIG. 11 based on
timing of frame synchronization acquired in the radio reception
unit 601-1, and outputs the down-converted signal to the A/D
conversion unit 602-2.
[0221] The A/D conversion unit 602-2 converts an analog signal of
an output of the radio reception unit 601-2 into a digital signal,
and outputs the digital signal to the band-specific channel
estimation unit 603-2 of the channel estimation unit 205b and the
CP removal unit 604-2 of the OFDM demodulation unit 206b.
[0222] The channel estimation unit 205b includes the band-specific
channel estimation units 603-1 and 603-2.
[0223] The band-specific channel estimation unit 603-1 performs
channel estimation in the PRBs arranged in the band of
N.sub.1W.sub.PRB by referring to a reference signal in the PRBs
arranged in the band of N.sub.1W.sub.PRB in the system band W'1,
and outputs an estimation result to the demodulation unit 606-1 of
the OFDM demodulation unit 206b.
[0224] The band-specific channel estimation unit 603-2 performs
channel estimation in the PRBs arranged in the band of
N.sub.2W.sub.PRB by referring to a reference signal in the PRBs
arranged in the band of N.sub.2W.sub.PRB in the system band W'2,
and outputs an estimation result to the demodulation unit 606-2 of
the OFDM demodulation unit 206b.
[0225] The OFDM demodulation unit 206b includes CP removal units
604-1 and 604-2, FFT units 605-1 and 605-2, and demodulation units
606-1 and 606-2.
[0226] The CP removal unit 604-1, the FFT unit 605-1, and the
demodulation unit 606-1 process the PRBs arranged in the band of
N.sub.1W.sub.PRB in the system band W'1.
[0227] The CP removal unit 604-1 removes a CP part from the digital
signal output from the A/D conversion unit 602-1.
[0228] A time domain signal from which a CP is removed in the CP
removal unit 604-1 is transformed into a modulation symbol (a
modulation symbol arranged on a plane in the frequency axis (the
band of N.sub.1W.sub.PRB) and the time axis) of each resource
element in the FFT unit 605-1, and the modulation symbol is output
to the FFT unit 605-1.
[0229] The demodulation unit 606-1 performs demodulation
processing, which corresponds to the modulation scheme used in the
modulation unit 504-1, for the modulation symbol into which the
transformation is performed while referring to a propagation
channel estimation value estimated in the propagation channel
estimation unit 603-1, and acquires a bit sequence (or bit
likelihood information or the like).
[0230] The CP removal unit 604-2, the FFT unit 605-2, and the
demodulation unit 606-2 process the PRBs arranged in the band of
N.sub.2W.sub.PRB in the system band W'2.
[0231] The CP removal unit 604-2 removes a CP part from the digital
signal output from the A/D conversion unit 602-2, and outputs a
removal result to the FFT unit 605-2.
[0232] A time domain signal from which a CP is removed in the CP
removal unit 604-2 is transformed into a modulation symbol (a
modulation symbol arranged on a plane in the frequency axis (the
band of N.sub.2W.sub.PRB) and the time axis) of each resource
element in the FFT unit 605-2, and the modulation symbol is output
to the demodulation unit 606-2.
[0233] The demodulation unit 606-2 performs demodulation
processing, which corresponds to the modulation scheme used in the
modulation unit 504-2, for the modulation symbol into which the
transformation is performed while referring to a propagation
channel estimation value estimated in the propagation channel
estimation unit 603-2, and acquires a bit sequence (or bit
likelihood information or the like).
[0234] If data extraction is prepared and set using information
within the PBCH by cell selection or reselection processing, the
data extraction unit 207 extracts broadcast information from PRBs
of a band including the PBCH, and prepares and sets the data
extraction in the system bands W'1 and W'2.
[0235] Alternatively, once the scheduling unit 204 is notified of
the broadcast information or the upper layer is notified of the
broadcast information via the scheduling unit 204, the data
extraction is set in the system bands W'1 and W'2 based on
instructions thereof. At this time, the scheduling unit 204 or the
upper layer notifies the radio reception units 601-1 and 601-2 of
information regarding the system bands.
[0236] If data for which data extraction is already set in the
system bands W'1 and W'2 is received (normal communication is
performed), the data extraction unit 207b maps PRBs to the
transport channel based on the scheduling information. At this
time, the data extraction unit 207b maps PRBs arranged in the band
of N.sub.1W.sub.PRB within the system band W'1, which is an output
of the demodulation unit 606-1, and PRBs arranged in the band of
N.sub.2W.sub.PRB within the system band W'2, which is an output of
the demodulation unit 606-2, to the transport channel.
[0237] Here, blocks divided to perform the same processing for
different signals have been described, but one circuit may be
shared.
[0238] Processing of the base station device 100 and the mobile
station device 200 will be described by returning to the
description of the first embodiment.
[0239] A master region is a downlink frequency layer (system band)
to be initially accessed by the mobile station device 200, and the
mobile station device 200 can access another region (slave region)
after acquiring a signal of the region. A downlink synchronization
signal (SCH) by which at least downlink synchronization can be
acquired is arranged.
[0240] The slave region is a downlink frequency layer (system band)
to be accessed after the mobile station device 200 acquires
information in the master region.
[0241] The master region and the slave region may be different for
each mobile station device 200. That is, the master region for a
certain mobile station device 200 may be configured to be the slave
region of another mobile station device 200. In this case, the
downlink synchronization signal (SCH) may be arranged even in the
slave region for a certain mobile station device 200. The
presence/absence of specific channels (the downlink synchronization
signal (SCH), the physical downlink broadcast channel (PBCH), the
BCCH, the PCCH, the CCCH, and/or the like) of the slave region is
broadcast from the base station device 100 to the mobile station
device 200 by the master region.
[0242] The master region and the slave region may be arranged at
adjacent carrier frequencies or separated carrier frequencies.
[0243] Uplink and downlink PRB resource allocations are performed
by the PDCCH. A format in which PRB resources of the master region
are allocated, a format in which PRB resources of the slave region
are allocated, and a format in which PRB resources of both the
master and slave regions are allocated are prepared. The mobile
station device 200 changes the format of the PDCCH to be monitored
in response to detection of the fact that the mobile station device
200 can access the master region and/or the slave region.
[0244] Alternatively, the format directed to the mobile station
device 200 to access only the master or slave region and the format
directed to the mobile station device 200 to access both the master
and slave regions are prepared by the PDCCH. The mobile station
device 200 changes the format of the PDCCH to be monitored in
response to detection of the fact that the master and/or slave
regions can be accessed.
[0245] FIG. 14(b) is a sequence diagram showing processing of the
radio communication system according to the first embodiment of the
present invention.
[0246] First, the mobile station device 200 acquires a downlink
synchronization signal (SCH) transmitted from the base station
device 100 by cell selection or reselection processing, and
performs downlink synchronization processing (step S101). At this
time, the downlink synchronization signal (SCH) is arranged in a
master region Z01 (see FIG. 14(a)).
[0247] The mobile station device 200 acquires the PBCH so that
processing is performed in the master region Z01 (manipulation is
performed in the master region Z01) (step S102). At this time,
information regarding an aggregation resource region including a
slave region Z02 (see FIG. 14(a)) (information indicating a system
bandwidth (the number of resource blocks) of the master region Z01,
a carrier frequency, a system bandwidth (the number of resource
blocks), or the like of the slave region Z02, version information
of the mobile station device 200, and/or the like), and the like is
acquired from the PBCH.
[0248] Information regarding aggregation resources includes
information for recognizing a width of a guard band between the
master region Z01 and the slave region Z02 or between a plurality
of system bands included in the entire system. Here, the width of
the guard band between the system bands is defined as a width
between effective bands excluding the guard band included in the
system band. That is, it is a bandwidth between adjacent effective
resource blocks within the system.
[0249] For example, if bandwidths each including a guard band are
W.sub.1, W.sub.2, W.sub.3, and W.sub.4, and bandwidths between the
system bands are W.sub.D1-2, W.sub.D2-3, and W.sub.D3-4 in the case
where system bands SW1, SW2, SW3, and SW4 are configured, effective
bandwidths each excluding the guard band are automatically
calculated from N.sub.1W.sub.PRB, N.sub.2W.sub.PRB,
N.sub.3W.sub.PRB, and N.sub.4W.sub.PRB. At this time, system
bandwidths each including the guard band (information of the master
region Z01 may be omitted), bandwidths between the system bands,
and effective bandwidths (information of the master region Z01 may
be omitted) are included in the information regarding the
aggregation resource region.
[0250] FIG. 15 is a diagram showing an example of a configuration
of system bands used in the first embodiment of the present
invention. In FIG. 15, the horizontal axis represents a frequency.
In FIG. 15, a guard band is arranged in a shaded region (for
example, a region R11). For example, as shown in FIG. 15, if system
bands SW1, SW2, SW3, and SW4 are configured, it is assumed that
bandwidths each including a guard band are W.sub.1, W.sub.2,
W.sub.3, and W.sub.4, bandwidths between the system bands are
W.sub.D1-2, W.sub.D2-3, and W.sub.D3-4, and effective bandwidths
each excluding the guard band are N.sub.1W.sub.PRB,
N.sub.2W.sub.PRB, N.sub.3W.sub.PRB, and N.sub.4W.sub.PRB. In this
case, the guard band included in each system band is automatically
calculated from W.sub.i-N.sub.iW.sub.PRB. At this time, system
bandwidths each including the guard band (information of the master
region Z01 may be omitted), bandwidths between the system bands,
and effective bandwidths (information of the master region may be
omitted) are included in the information regarding the aggregation
resource region.
[0251] FIG. 16 is a diagram showing another example of a
configuration of system bands used in the first embodiment of the
present invention. In FIG. 16, the horizontal axis represents a
frequency. In FIG. 16, a guard band is arranged in a shaded region
(for example, a region R12). For example, as shown in FIG. 16, if
system bands SW1, SW2, SW3, and SW4 are configured, effective
bandwidths N.sub.1W.sub.PRB, N.sub.2W.sub.PRB, N.sub.3W.sub.PRB,
and N.sub.4W.sub.PRB, a guard band N.sub.G1-2W.sub.PRB between the
system bands SW1 and SW2, a guard band N.sub.G2-3W.sub.PRB between
the system bands SW2 and SW3, and a guard band N.sub.G3-4W.sub.PRB
between the system bands SW3 and SW4 are broadcast. Each bandwidth
may be expressed by a signal of the number of resource blocks,
N.sub.i. If N.sub.1, N.sub.2, N.sub.3, and N.sub.4, which are the
number of PRBs, are the same value, it is preferable to broadcast
only one value N.sub.i. Processing of the mobile station device
200, which is a receiver, is facilitated by configuring the guard
band by an integer multiple of W.sub.PRB. If the guard bands
N.sub.G1-2, N.sub.G2-3, and N.sub.G3-4 are the same value, it is
preferable to broadcast only one value N.sub.G. In a situation
where the mobile station device 200 can perform reception without
the guard band, the guard band may be designated as 0. In this
case, N.sub.G=0 is broadcast.
[0252] Indices capable of specifying all or each of W.sub.1,
W.sub.2, W.sub.3, W.sub.4, N.sub.1W.sub.PR, N.sub.2W.sub.PR,
N.sub.3W.sub.PRB, N.sub.4W.sub.PRB, N.sub.G1-2W.sub.PRB,
N.sub.G2-3W.sub.PRB, and N.sub.G3-4W.sub.PRB may be defined. Only
the indices are broadcast, so that the mobile station device 200
may specify the above-described values from the indices.
[0253] If there is no information regarding aggregation resources,
continuous processing is performed so that manipulation is directly
performed in the master region Z01. Information regarding the
aggregation resource region including the slave region Z02 may be
arranged in a region separated from the PBCH.
[0254] For example, the PBCH is transmitted in first, second,
third, and fourth OFDM symbols of a second slot (slot #1) of a
first subframe (subframe #0), but a new PBCH may be transmitted in
fifth to seventh OFDM symbols of a second slot (slot #1).
[0255] The base station device 100 includes information regarding
an aggregation resource region including the slave region Z02 in
the new PBCH, and transmits the new PBCH to the mobile station
device 200 (step S103 of FIG. 14(b)).
[0256] The mobile station device 200 having the capability for
aggregation acquires both of the PBCH transmitted in the first,
second, third, and fourth OFDM symbols of the second slot (slot #1)
and the new PBCH transmitted in the fifth to seventh OFDM symbols
of the second slot (slot #1).
[0257] Thereby, information for the mobile station device 200 (the
mobile station device 200 capable of accessing the master region
Z01 and the slave region Z02) having the capability for aggregation
and information for the mobile station device 200 (the mobile
station device Z02 capable of accessing only the master region Z01)
without the capability for aggregation can be efficiently
separated.
[0258] If the information regarding the aggregation resource region
is acquired (if the new PBCH is successfully decoded), the mobile
station device 200 adjusts the radio unit to receive up to the
slave region Z02, if necessary (step S104 of FIG. 14(b)).
[0259] If the adjustment of the radio unit 203a (FIG. 7) is not
necessary (if the master region Z01 and the slave region Z02 are
adjacent), a countermeasure is taken by adjusting a channel
acquisition unit. Continuous processing is performed so that
manipulation is performed in the aggregation resource region. That
is, the mobile station device 200 performs decoding of the PDCCH on
the assumption of aggregation (decoding of the PDCCH of a resource
allocation information format after aggregation), and performs
connection setup processing subsequent to the acquisition of
broadcast information (BCCH) thereafter (step S105 of FIG.
14(b)).
[0260] In a band in which only the mobile station device 200 having
the capability for aggregation is accommodated, the base station
device 100 constantly uses the PDCCH of the resource allocation
information format after the above-described aggregation,
regardless of the capability of the mobile station device 200. That
is, the base station device 100 does not need to know the master
region Z01 to be accessed by the mobile station device 200.
[0261] FIG. 14(a) shows a frequency region in which the mobile
station device 200 can perform reception in each step. In steps
S101 to S104, the mobile station device 200 can receive regional
resources necessary to acquire the PBCH arranged in part of the
master region Z01. After step S104, the mobile station device 200
can receive regional resources of the master region Z01 and the
slave region Z02.
[0262] In the first embodiment of the present invention, the radio
unit 103a (also referred to as a signal transmission unit) of the
base station device 100 (FIG. 6) transmits a signal including
information, which specifies at least one slave region Z02 (also
referred to as a second frequency band) different from the master
region Z01 (also referred to as a first frequency band), to the
mobile station device 200 with use of the master region Z01.
[0263] The data extraction unit 207a (also referred to as an
information acquisition unit) of the mobile station device 200
(FIG. 7) acquires information, which is included in a signal
transmitted from the base station device 100 with use of the master
region Z01 and specifies the slave region Z02.
[0264] The scheduling unit 204 (also referred to as a frequency
band specification unit) specifies the slave region Z02 based on
information acquired by the data extraction unit 207a.
[0265] Specifically, the scheduling unit 204 specifies the slave
region Z02 based on information included in the PBCH transmitted in
a predetermined frequency bandwidth within the master region Z01.
Also, the scheduling unit 204 may specify whether or not to include
a specific channel (the PBCH or the like) located within the slave
region Z02 based on information acquired by the data extraction
unit 207a.
[0266] The radio unit 203a (also referred to as a communication
unit) communicates with the base station device 100 by using the
master region Z01 or the slave region Z02.
[0267] In the radio communication system according to the first
embodiment of the present invention, the mobile station device 200
can initially access the master region Z01 and can acquire
information specifying the slave region Z02 from information
included in the master region Z01. Consequently, it is not
necessary to separately receive information specifying the slave
region Z02 from the base station device 100. Thus, at the
initiation of communication, information to be transmitted from the
base station device 100 to the mobile station device 200 can be
reduced, and communication can be rapidly initiated between the
base station device 100 and the mobile station device 200.
Second Embodiment
[0268] Next, a radio communication system according to the second
embodiment of the present invention will be described. The radio
communication system according to the second embodiment includes a
base station device 100' and a mobile station device 200'. Since
configurations of the base station device 100' and the mobile
station device 200' according to the second embodiment are the same
as those of the base station device 100 (FIG. 6) and the mobile
station device 200 (FIG. 7) according to the first embodiment,
description thereof is omitted. Hereinafter, only parts of the
second embodiment different from the first embodiment will be
described.
[0269] FIG. 17(b) is a sequence diagram showing processing of the
radio communication system according to the second embodiment of
the present invention.
[0270] First, the mobile station device 200' acquires a downlink
synchronization signal (SCH) of the base station device 100' by
cell selection or reselection processing, and performs downlink
synchronization processing (step S201). At this time, the downlink
synchronization signal (SCH) is arranged in the master region Z01
(see FIG. 17(a)).
[0271] The mobile station device 200' acquires the PBCH so that
manipulation is performed in the master region Z01 (step S202).
[0272] At this time, information regarding the master region Z01 (a
system bandwidth (the number of resource blocks) of the master
region Z01 or the like) is acquired from the PBCH (step S203).
[0273] Continuous processing is performed so that manipulation is
performed in the master region Z01 (step S204).
[0274] The mobile station device 200' receives the BCCH mapped to
the DL-SCH in the master region Z01 (Step 205).
[0275] Since the DL-SCH is transmitted by dynamic resources of the
PDSCH designated by the PDCCH, resources can be dynamically
changed. If information regarding an aggregation resource region
(information indicating a system bandwidth (the number of resource
blocks) of the master region Z01, information indicating a carrier
frequency, a system bandwidth (the number of resource blocks), or
the like of the slave region Z02 (see FIG. 17(a)), version
information of the mobile station device 200', and/or the like) is
acquired by the BCCH, the mobile station device 200' adjusts the
radio unit to receive up to the slave region Z02 (step S206).
[0276] As in the first embodiment, information regarding
aggregation resources includes information for recognizing a width
of a guard band between the master region Z01 and the slave region
Z02 or between a plurality of system bands included in the entire
system.
[0277] Thereafter, continuous processing is performed so that
manipulation is performed in the aggregation resource region or the
master region Z01. That is, the mobile station device 200' performs
decoding of the PDCCH on the assumption of aggregation (decoding of
the PDCCH of a resource allocation information format after
aggregation), and performs normal communication by performing
connection setup processing subsequent to the acquisition of
broadcast information (BCCH) thereafter (step S207).
[0278] When a plurality of master regions Z01 are provided in an
accommodation band, the base station device 100' needs to detect
the master region Z01 of the mobile station device 200'. The PRACH
or RACH is used in the detection of the master region Z01 of the
mobile station device 200'.
[0279] For example, the base station device 100' broadcasts
information regarding the aggregation resource region and
information indicating physical random access resources of the
master region Z01 to each mobile station device 200'. The mobile
station device 200' performs random access using physical random
access resources indicated in an accessed region. Thus, the base
station device 100' can determine what is a region used by the
mobile station device 200' having the random access as the master
region Z01 from physical random access resources used by the mobile
station device 200', and can use the PDCCH, under assumption that
the master region Z01 is specified, in random access processing and
subsequent processing. In the CCCH, the master region Z01 of the
mobile station device 200' is reported from the mobile station
device 200' to the base station device 100' during a random access
procedure.
[0280] If the mobile station device 200' having the capability for
aggregation and the mobile station device 200' without the
capability for aggregation are accommodated in the accommodation
band, the base station device 100' needs to detect the capability
for aggregation of the mobile station device 200'. The PRACH or
RACH is used in the detection of the capability for aggregation of
the mobile station device 200'.
[0281] For example, the base station device 100' broadcasts the
information regarding the aggregation resource region and the
information indicating physical random access resources for the
mobile station device 200' to each mobile station device 200'. When
the aggregation is used, random access is performed using the
physical random access resources for the mobile station device 200'
using the aggregation. Thus, the base station device 100' can
determine whether or not the mobile station device 200' having the
random access has the capability for aggregation from the used
physical random access resources, and can use the PDCCH, under
assumption that the aggregation is performed, in random access
processing and subsequent processing. In the CCCH, the capability
for aggregation of the mobile station device 200' may be reported
from the mobile station device 200' to the base station device 100'
during a random access procedure. A downlink band used during the
random access procedure is the master region Z01.
[0282] Further, the mobile station device 200' may perform parallel
processing so that manipulation is performed in the master region
Z01. A mobile station device incapable of using the aggregation or
a mobile station device incapable of decoding the information
regarding the aggregation resource region performs processing so
that manipulation is performed in the master region Z01.
[0283] The presence/absence of a specific channel (the downlink
synchronization signal (SCH), the PBCH, the BCCH, or the like)
within the slave region Z02 is broadcast to each mobile station
device 200' by the master region Z01. If a plurality of slave
regions Z02 exist, the base station device 100' broadcasts the
presence/absence of a specific channel of each region to the mobile
station device 200'. The mobile station device 200' specifies the
presence/absence of the specific channel of each region from
broadcast information. At this time, it is possible to efficiently
operate the system without arranging the BCCH in the slave region
Z02 by configuring the system so that the BCCH mapped to the DL-SCH
is transmitted only in the master region Z01.
[0284] FIG. 17(a) shows a frequency region capable of being
received by the mobile station device 200' in each step. In steps
S201 to S203, the mobile station device 200' can receive regional
resources necessary to acquire the PBCH arranged in part of the
master region Z01. In steps S203 to S206, the mobile station device
200' can receive regional resources of the master region Z01. After
step S206, the mobile station device 200' can receive regional
resources of the master region Z01 and the slave region Z02.
[0285] In the second embodiment of the present invention, the radio
unit 103a (also referred to as a signal transmission unit) of the
base station device 100' (FIG. 6) transmits a signal including
information, which specifies at least one slave region Z02 (also
referred to as a second frequency band) different from the master
region Z01 (also referred to as a first frequency band), to the
mobile station device 200' with use of the master region Z01.
[0286] The data extraction unit 207a (also referred to as an
information acquisition unit) of the mobile station device 200'
(FIG. 7) acquires information, which is included in a signal
transmitted from the base station device 100' with use of the
master region Z01 and specifies the slave region Z02.
[0287] The scheduling unit 204 (also referred to as a frequency
band specification unit) specifies the slave region Z02 based on
information acquired by the data extraction unit 207a.
[0288] Specifically, the scheduling unit 204 specifies the slave
region Z02 based on broadcast information included in the PDSCH
transmitted in a predetermined frequency bandwidth within the
master region Z01.
[0289] Also, the scheduling unit 204 may specify the slave region
Z02 based on control information directed to a specific mobile
station device 200' transmitted in the PDSCH within the master
region Z01.
[0290] The radio unit 203a (also referred to as a communication
unit) communicates with the base station device 100' by using the
master region Z01 or the slave region Z02.
[0291] In this embodiment, the mobile station device 200' may
acquire downlink control information, which designates resources
within the master region Z01 and the slave region Z02, from the
base station device 100' after resources of broadcast information
is designated by a downlink control signal, which designates
resources within the master region Z01, and the master region Z01
may be specified.
[0292] In the radio communication system according to the second
embodiment of the present invention, the mobile station device 200'
can initially access the master region Z01 and can acquire
information specifying the slave region Z02 from the information
included in the master region Z01. Consequently, it is not
necessary to separately receive information specifying the slave
region Z02 from the base station device 100'. Thus, it is possible
to reduce information to be transmitted from the base station
device 100' to the mobile station device 200' at the initiation of
communication, and to rapidly initiate communication between the
base station device 100' and the mobile station device 200'.
[0293] Specifically, since information regarding the aggregation
resource region is acquired by receiving the BCCH mapped to the
DL-SCH, there is an advantageous effect in that resources can be
dynamically changed.
Third Embodiment
[0294] Next, a radio communication system according to the third
embodiment of the present invention will be described. The radio
communication system according to the third embodiment includes a
base station device 100'' and a mobile station device 200''. Since
configurations of the base station device 100'' and the mobile
station device 200'' according to the second embodiment are the
same as those of the base station device 100'' (FIG. 6) and the
mobile station device 200'' (FIG. 7) according to the first
embodiment, description thereof is omitted. Hereinafter, only parts
of the third embodiment different from the first embodiment will be
described.
[0295] FIG. 18(b) is a sequence diagram showing processing of the
radio communication system according to the third embodiment of the
present invention.
[0296] First, the mobile station device 200'' acquires a downlink
synchronization signal (SCH) of the base station device 100'' by
cell selection or reselection processing, and performs downlink
synchronization processing (step S301). At this time, the downlink
synchronization signal (SCH) is arranged in the master region Z01
(see FIG. 18(a)).
[0297] The mobile station device 200'' acquires the PBCH so that
manipulation is performed in the master region Z01 (step S302). At
this time, information regarding the master region Z01 (a system
bandwidth (the number of resource blocks) of the master region Z01
or the like) is acquired from the PBCH (step S303). Continuous
processing is performed so that manipulation is performed in the
master region Z01 (step S304).
[0298] The mobile station device 200'' performs RRC connection
establishment procedure by the master region Z01 and establishes a
communication state (RRC connection state). In RRC connection setup
(the CCCH (RRC signaling)) during the RRC connection establishment
procedure or the DCCH (RRC signaling) directed to the mobile
station device 200'' during communication, information regarding an
aggregation resource region (information indicating a system
bandwidth (the number of resource blocks) of the master region Z01,
information indicating a carrier frequency, a system bandwidth (the
number of resource blocks), or the like of the slave region Z02
(see FIG. 18(a)), version information of the mobile station device
200'', and/or the like) is reported from the base station device
100'' to the mobile station device 200'' (step S305).
[0299] The CCCH or DCCH is mapped to the DL-SCH in the master
region Z01. Since the DL-SCH is transmitted by dynamic resources of
the PDSCH designated by the PDCCH, resources can be dynamically
changed.
[0300] The mobile station device 200'' acquiring information
regarding an aggregation resource region adjusts the radio unit
203a (FIG. 7) to receive up to the slave region Z02 (step S306).
Thereafter, continuous processing is performed so that manipulation
is performed in the aggregation resource region or the aggregation
resource region and the master region Z01.
[0301] That is, the mobile station device 200'' performs decoding
of the PDCCH on the assumption of aggregation (decoding of the
PDCCH of a resource allocation information format after
aggregation) after checking the CCCH or DCCH (RRC signaling) (step
S307).
[0302] When a plurality of master regions Z01 are provided in an
accommodation band, the base station device 100'' needs to detect
the master region Z01 of the mobile station device 200''. As in the
second embodiment, the master region Z01 of the mobile station
device 200'' is detected using the PRACH or RACH, or the master
region Z01 of the mobile station device 200'' is reported from the
mobile station device 200'' to the base station device 100'' by the
CCCH during a random access procedure.
[0303] The master region Z01 of the mobile station device 200'' can
be designated from the base station device 100'' by the DCCH (RRC
signaling), and can be changed.
[0304] If a mobile station device 200'' having the capability for
aggregation and a mobile station device 200'' without the
capability for aggregation are accommodated in the accommodation
band, the base station device 100'' needs to detect the capability
for aggregation of the mobile station device 200''.
[0305] The base station device 100'' uses information from the
upper layer in the detection of the capability for aggregation of
the mobile station device 200''. The base station device 100''
determines whether or not the mobile station device 200'' having
random access has the capability for aggregation. If the base
station device 100'' instructs the mobile station device 200'' to
use aggregation resources, the aggregation resources are designated
by the DCCH (RRC signaling).
[0306] By the CCCH, the capability for aggregation of the mobile
station device 200'' may be reported from the mobile station device
200'' to the base station device 100'' during the random access
procedure.
[0307] Further, the mobile station device 200'' may perform
parallel processing so that manipulation is performed in the master
region Z01. The mobile station device 200'', which does not acquire
the information regarding the aggregation resource region, may
perform processing so that manipulation is performed in the master
region Z01.
[0308] The presence/absence of a specific channel (the downlink
synchronization signal (SCH), the PBCH, the BCCH, or the like)
within the slave region Z02 is broadcast by the master region Z01.
The presence/absence of the specific channel within the slave
region Z02 is reported from the base station device 100'' to the
mobile station device 200'' by dedicated control information. The
mobile station device 200'' specifies the presence/absence of a
specific channel of each region from broadcast information or
dedicated control information.
[0309] If a plurality of slave regions Z02 exist, the base station
device 100'' reports the presence/absence of a specific channel of
each region to the mobile station device 200''. At this time, it is
possible to efficiently operate the system without arranging the
BCCH in the slave region Z02 by configuring the system so that the
BCCH mapped to the DL-SCH is transmitted only in the master region
Z01.
[0310] FIG. 18(a) shows a frequency region capable of being
received by the mobile station device 200'' in each step. In steps
S301 to S303, the mobile station device 200'' can receive regional
resources necessary to acquire the PBCH arranged in part of the
master region Z01. In steps S303 to S306, the mobile station device
200'' can receive regional resources of the master region Z01.
After step S306, the mobile station device 200'' can receive
regional resources of the master region Z01 and the slave region
Z02.
[0311] In the radio communication system according to the third
embodiment of the present invention, the mobile station device
200'' can initially access the master region Z01 and can acquire
information specifying the slave region Z02 from the information
included in the master region Z01. Consequently, it is not
necessary to separately receive information specifying the slave
region Z02 from the base station device 100'' as in the first
embodiment. Thus, it is possible to reduce information to be
transmitted from the base station device 100'' to the mobile
station device 200'' at the initiation of communication, and to
rapidly initiate communication.
[0312] Specifically, since information regarding the aggregation
resource region is acquired by receiving the BCCH mapped to the
DL-SCH, there is an advantageous effect in that aggregation
resources to each of specific mobile station devices can be changed
in application.
[0313] In the above-described embodiments, for convenience of
description, the expressions of the capability for aggregation and
the information regarding the aggregation resource region has been
used, but the expressions may respectively indicate versions (a
release version, an operation version, and the like) of the mobile
station devices (the mobile station devices 200, 200', and 200'')
and information regarding a region for a new version of mobile
station device. That is, the mobile station device not having the
capability for aggregation exists if the release version of the
mobile station device is old, and the capability for aggregation is
provided if the release version of the mobile station device is
new.
[0314] The system configured by aggregating a plurality of system
bands has been described in the above-described embodiments, but
one system may be configured by a plurality of sub system bands.
Each system band (or sub system band) is also called a carrier
component. This indicates a region where the system is operated by
a specific receiver or transmitter focusing on a carrier frequency
at the center of carrier components.
[0315] An example in which the base station devices (the base
station devices 100, 100', and 100'') correspond in one-to-one
relation to the mobile station devices (the mobile station devices
200, 200', and 200'') has been described for convenience of
description in the above-described embodiments, but a plurality of
base station devices and mobile station devices may be provided.
The mobile station device is not limited to a mobile terminal, and
may be realized by embedding a function of the mobile station
device in the base station device or a fixed terminal.
[0316] In the above-described embodiments, a program for
implementing functions within the base station device or functions
of the mobile station device may be recorded on a computer readable
recording medium. The base station device or the mobile station
device may be controlled by enabling a computer system to read and
execute the program recorded on the recording medium. The "computer
system" used herein includes an OS and hardware, such as peripheral
devices.
[0317] The "computer readable recording medium" is a portable
medium such as a flexible disc, magneto-optical disc, ROM and
CD-ROM, and a storage device, such as a hard disk, built in the
computer system. Furthermore, the "computer readable recording
medium" may also include a medium that dynamically holds a program
for a short period of time, such as a communication line when a
program is transmitted via a network such as the Internet or a
communication network such as a telephone network, and a medium
that holds a program for a fixed period of time, such as a volatile
memory in a computer system serving as a server or client in the
above situation. The program may be one for implementing part of
the above functions, or the above functions may be implemented in
combination with a program already recorded on the computer
system.
[0318] The embodiments of the present invention have been described
in detail with reference to the drawings. However, specific
configurations are not limited to the embodiments and may include
any design in the scope without departing from the subject matter
of the present invention.
INDUSTRIAL APPLICABILITY
[0319] The present invention is applicable to a communication
system, a mobile station device, a communication method, and the
like that can reduce information to be transmitted from a base
station device to the mobile station device at the initiation of
communication and that can rapidly initiate communication.
REFERENCE SYMBOLS
[0320] 100: Base station device
[0321] 101a, 101b: Data control unit
[0322] 102a, 102b: OFDM modulation unit
[0323] 103a, 103b: Radio unit
[0324] 104: Scheduling unit
[0325] 105: Channel estimation unit
[0326] 106: DFT-S-OFDM demodulation unit
[0327] 107: Data extraction unit
[0328] 108: Upper layer
[0329] 200: Mobile station device
[0330] 201: Data control unit
[0331] 202: DFT-S-OFDM modulation unit
[0332] 203a, 203b: Radio unit
[0333] 204: Scheduling unit
[0334] 205a, 205b: Channel estimation unit
[0335] 206a, 206b: OFDM demodulation unit
[0336] 207a, 207b: Data extraction unit
[0337] 208: Upper layer
[0338] 301: Physical mapping unit
[0339] 302: Reference signal generation unit
[0340] 303: Synchronization signal generation unit
[0341] 304: Modulation unit
[0342] 305: IFFT unit
[0343] 306: CP insertion unit
[0344] 307: D/A conversion unit
[0345] 308: Radio transmission unit
[0346] 401: Radio reception unit
[0347] 402: A/D conversion unit
[0348] 403: CP removal unit
[0349] 404: FFT unit
[0350] 405: Demodulation unit
[0351] 501: Physical mapping unit
[0352] 502: Reference signal generation unit
[0353] 503: Synchronization signal generation unit
[0354] 504-1, 504-2: Modulation unit
[0355] 505-1, 505-2: IFFT unit
[0356] 506-1, 506-2: CP insertion unit
[0357] 507-1, 507-2: D/A conversion unit
[0358] 508-1, 508-2: Radio transmission unit
[0359] 601-1, 601-2: Radio reception unit
[0360] 602-1, 602-2: A/D conversion unit
[0361] 603-1, 603-2: Band-specific channel estimation unit
[0362] 604-1, 604-2: CP removal unit
[0363] 605-1, 605-2: FFT unit
[0364] 606-1, 606-2: Demodulation unit
[0365] A1, A2: Antenna unit
* * * * *